Description Heat quartz ceramic crucibles slowly and be sure to glaze the bowl with borax before use. These bowls are professional-grade for metal melting, trusted by jewelers, and are of sufficient quality for use. Ceramic quartz crucibles are 99.99% high purity, corrosion-resistant, made of durable quartz, with strong thermal conductivity, chemical resistance, and high-temperature resistance, withstanding temperatures of 2800 degrees. The handle provides a comfortable grip during use and protects your hand. Professional meltable ceramic crucible set for jewelry melting tools, also great for torch firing applications with gold, brass, bronze, silver, copper, and alloy melting. Also useful for jewelers, metalworkers/blacksmiths/chemical refineries. 4 pcs Quartz Crucibles Bowls Cups for Jewelry Silver Gold Casting Melting Refining with Pour Spout (approx. 100g capacity), a 304 stainless steel whisk tongs handle 2A Color: White+Silver Material: Quartz+Metal Package Contents: 4 x Quartz Crucibles Bowls Cups (100G) 1 x Crucible Tongs Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to differ slightly from the real thing. The allowable measurement error is +/- 1-3 cm.